reading-time

This plugin will generate word count and estimated reading time for each page.

Usage

npm i -D @vuepress/plugin-reading-time@next

import { readingTimePlugin } from '@vuepress/plugin-reading-time'

export default {
  plugins: [
    readingTimePlugin({
      // options
    }),
  ],
}

The plugin will inject reading time information into the readingTime of the page data, where:

readingTime.minutes: estimated reading time (minutes) number
readingTime.words: word count number

Getting data on Node Side

For any page, you can get estimated reading time and word count from page.data.readingTime:

page.data.readingTime // { minutes: 3.2, words: 934 }

You can access it for further processing in the extendsPage lifecycle and other lifecycle:

export default {
  // ...
  extendsPage: (page) => {
    page.data.readingTime // { minutes: 3.2, words: 934 }
  },

  onInitialized: (app) => {
    app.pages.map((page) => {
      page.data.readingTime // { minutes: 3.2, words: 934 }
    })
  },
}

Getting data on Client Side

You can import useReadingTimeData and useReadingTimeLocale from @vuepress/plugin-reading-time/client to get the reading time data and locale data of the current page:

<script setup lang="ts">
import {
  useReadingTimeData,
  useReadingTimeLocale,
} from '@vuepress/plugin-reading-time/client'

const readingTimeData = useReadingTimeData() // { minutes: 1.1, words: 100 }
const readingTimeLocale = useReadingTimeLocale() // { time: "1 minute", words: "100 words" }
</script>

Options

wordPerMinute

Type: number
Default: 300
Details: Reading speed (words per minute)

locales

Type: ReadingTimePluginLocaleConfig

interface ReadingTimePluginLocaleData {
  /**
   * Word template, `$word` will be automatically replaced by actual words
   */
  word: string

  /**
   * Text for less than one minute
   */
  less1Minute: string

  /**
   * Time template
   */
  time: string
}

interface ReadingTimePluginLocaleConfig {
  [localePath: string]: ReadingTimePluginLocaleData
}

Required: No
Details:
Locales config for reading-time plugin.

Built-in Supported Languages

Simplified Chinese (zh-CN)
Traditional Chinese (zh-TW)
English (United States) (en-US)
German (de-DE)
German (Australia) (de-AT)
Russian (ru-RU)
Ukrainian (uk-UA)
Vietnamese (vi-VN)
Portuguese (Brazil) (pt-BR)
Polish (pl-PL)
French (fr-FR)
Spanish (es-ES)
Slovak (sk-SK)
Japanese (ja-JP)
Turkish (tr-TR)
Korean (ko-KR)
Finnish (fi-FI)
Indonesian (id-ID)
Dutch (nl-NL)

Client API

You can import and use these APIs from @vuepress/plugin-reading-time/client:

These APIs won't throw even you disable the plugin.

useReadingTimeData

interface ReadingTime {
  /** Expect reading time in minute unit */
  minutes: number
  /** Words count of content */
  words: number
}

const useReadingTimeData: () => ComputedRef<ReadingTime | null>

null is returned when the plugin is disabled.

useReadingTimeLocale

interface ReadingTimeLocale {
  /** Expect reading time text in locale */
  time: string
  /** Word count text in locale */
  words: string
}

const useReadingTimeLocale: () => ComputedRef<ReadingTimeLocale>

Advanced Usage

This plugin is targeting plugin and theme developers mostly, so we provide a "Use API":

import { useReadingTimePlugin } from '@vuepress/plugin-reading-time'

export default (options) => (app) => {
  useReadingTimePlugin(app, {
    // your options
  })

  return {
    name: 'vuepress-plugin-xxx', // or vuepress-theme-xxx
  }
}

Why you should use "Use API"

When you register a plugin multiple times, vuepress will gives you warning about that telling you only the first one takes effect. The useReadingTimePlugin automatically detects if the plugin is registered and avoid registering multiple times.
If you access reading time data in extendsPage lifecycle, then @vuepress/plugin-reading-time must be called before your theme or plugin, otherwise you will get undefined for page.data.readingTime. The useReadingTimePlugin ensures that @vuepress/plugin-reading-time is called before your theme or plugin.

We also provides a removeReadingTimePlugin api to remove the plugin.You can use this to ensure your call take effect or clear the plugin:

import { useReadingTimePlugin } from '@vuepress/plugin-reading-time'

export default (options) => (app) => {
  // this removes any existing reading time plugin at this time
  removeReadingTimePlugin(app)

  // so this will take effect even if there is a reading time plugin registered before
  useReadingTimePlugin(app, {
    // your options
  })

  return {
    name: 'vuepress-plugin-xxx', // or vuepress-theme-xxx
  }
}